Screw.



A. G. AICHMA.

SGREW.

APPLIUATION FILED ooT.1.19os.

Patented May 18, 1909.

UNITED sTATEs AUeUsr c. ArenMA, or KALIsrELi., MONTANA.

SCREW.

Specification of Letters Patenti Patented my 1s, 1909.

Application led October 1, 1908. Serial No. 456,775.

To all 'wh-om 'it may concern.' v

Be it known that I, AUGUST C. ATCHMA, a citizen of the United States, residing at Kalispell, in the county oll Flathead and State of Montana, have invented certain new and useful Improvements in Screws, of which the following is a speeilication, reference being had therein to the accompanying drawing.

This invention relates to improvements in locking-screws, and has l'or its object, the provision ol' a screw, which, after it has been embedded in woodwork, or the like, can be electually locked therein to prevent it `from accidentally loosening or working out. Screws of this t pe will prove very useful, when used in tli cars, steamships, wagons, and the like, whic are subjected in use to a great amount ol' straining and vibration, which causes the ordinary screws to work loose and fall out.

A `further object oll the invention is to so locate the heads ol' the locking device, with respect to the slot in the head ol' the screw, that they will not ordinarily be noticed, and can be removed easily, if necessary, without the em iloyment ol' a specially constructed tool. In the manufacture ol' my lockingscrews, it will be preferable, to make the screws and locking devices of the same material, as this will render the heads of the locking-devices less noticeable.

Other ob'ects and advantages of this invention will appear in the course of the following specification.

In the drawings: Figure 1 is a side view, partly 'in section, ol' my improved lockingscrew. Fig. 2 is a top plan view of the head ol' the locklng-screw. ig. 3 is a side view, partly in section, showing the locking-screw embedded in woodwork, with the locking devices in position; and Fig. 4 is a top plan view of the head of the locking-screw, with the lockingdevices in position.

Referring to the drawing, which illustrates the preferred forni of my invention, 1 designates the, screw, which 1s provided with the usual threaded portion 2, and the transverse Laterally disosed with relation to the slot 3, and opening into the same, are two countersinks 4 and 5, which are, preferably, slightly oblong in 'sha e, as shown.

ormed inthe screw, on opposite sides thereof, are two longitudinal, circular' passages 6 and 7. The entrance 8 of the passage e construction ol' railwa 6 opens into the countersink 4, and the entrance 9 ol' the )assage 7 opens into the countersink 5. T e entrances 8 and 9 of the passages are located equi-distant from the sides a, b, and c, d ol' their respective countersinks, and while said entrances liewholly forward to be substanthe wall of the slot 3, through which said countersinks o en. The lower ends of the passages 6 an 7 are, as illustrated, curved outwardly to the points ol their respective exits, 10 and 1l, through the sides of the screw. The points of exit of the passages 6 and 7 are preferably located above' the threaded portion 2 of the screw.

After the screw has been embedded in the woodwork or the like, locking devices as nails 12 and 13 which are of a diameter slightly less than that of the passages 6 and 7 are driven through said passages. The nails, which are of greater length than the passages, on strikin g t 1e curved lower ends of said assages are caused to enter the surroun ing material in which the screw is embedded, and will assume an upwardly curved position therein as illustrated in Fig. 3. It will be noted that I have shown the locking devices or nails, as being provided with square heads, as that will greatly facilitate their removal over nails with any other shape of head, as they would present a broader bearing for the edge of the screw driver, when the same is used to start the lifting of the nails from their locking position.

Ol course the shape of the counter-sinks, as well as the sha e of the heads of the locking devices could he varied but it is, of course, desirable that they should be, in each locking-screw of a conforming design The heads of the locking device should be so proportioned as regards the counter-sinks as to fit therein, but not closely, and should blend with the head of the screw so as not to be ordinarily noticeable.

As has been previously stated, the entrances 8 and 9 of the passa es 6 and 7 are so located that they are equi( istant from the sides of their respective counter-sinks, and lie wholl within the same, yet they are far enough orward to be substantially in line with the wall of the s1ot3, through which said `counter-sinks open. The object for so locating these entrances is that, when the locking devices or nails are driven into place, one side of the heads thereof will project they are l'ar enou h tlally in line wlti within their respective countersinks, yet` slightly into the transverse slot 3 in the head of the screw, where the edge of the screwdriver can be readily inserted under them, when it is desired to raise said locking nails a little, in order they may be removed by an ordinary nail extractor, preparatory to removing the screw.

What I claim is:

1. A lookin screw having a slot in its head one side of W ich is provided with countersinks and having longitudinal assa es extending through the screw body an communicating with the countersinks, the lower ends of said passages being outwardly curved z and havin their exit through'the side of the Y screw, an

a locking device for each longitudinal passage the penetrating end of which is upwardly curved when forced through the passage,v said locking devices being provided 'counter-sinks having one side opening into with heads tting the co'untersinks in the head of the screw.

2. As an improved article of manufacture, a locking screw provided with a transverse slot in its head, and one side of said slot bein provided with counter-sinks, each of sai the slot, said screw provided with ngitudmally-extending assages communicating with the counter-sin s, and the lower ends of said passages being outwardly curved and having their exit through the side of the screw.

In testimony whereof I hereunto affix my signature in presence of two witnesses.

AUGUST C. AICHMAN. Witnesses:

THEoDoR HEINs, 4RICHARD BEST. 

